Tube-rolling mill



April 14, 1931.

F. KocKs 1,800,891

TUBE ROLLING MILL Filed Jan. 3. 1929 3 Sheets-Sheet 1 April 14, 1931. F.KocKs TUBE ROLLING MILL Filed Jan. 5, 1929 3 Sheets-Sheet 2 momai April14, 1931. F. KOCKS TUBE ROLLING MILL Filed Jan. 3, 1929 5 Sheets-Sheet 5Patented Apr. 14, 1931 PATENT OFFICE FRITZ KOOKS, F DUSSELDORF, GERMANYTUBE-ROLLING MEL Application filed January 3, 1929, Serial No. 329,998,and in Germany March 31, 1928.

My invention relates to tube-rolling mills of the type in which therolling process is subdivided into a punching and kneading stage. It isan ob'ect of my invention to a provide a mill of this type in which therolls are supported at both ends.

To this end I arrange the axes of one pair of rolls in a planeintersecting the plane in which the axes of the other pair are arranged.I may for instance provide one pair of rolls the axes of which extend ina vertical plane, and another pair in which the axes extend in ahorizontal plane, but it is not important that the planes shouldintersect at right angles nor is it important that the axes of the rollsin one or the other pair should extend in the same plane, but their axesmay be staggered, extending in parallel at either side of a centralplane which intersects the plane of the axes of the other pair or thecentral plane to which such axes are parallel.

For the purpose of this specification the term punching rolls as used inthe specification and in the claims appended to it is intended todesignate the rolls, which provide for the piercing of the billet andact mainly on the solid part of the billet, into which the mandrel isdesigned to enter. The term kneading rolls is applied to the rolls whichcooperate with the mandrel for forging the walls of the hollow tubularblank produced by the action of the punching rolls.

By this arrangement of the rolls I am enabled to provide bearings forthe support of the rolls of either end thereof although I do not wish tobe limited to bearings at either end of each roll. I may for instanceprovide bearings at either end of the punching rolls, but only at oneend of the transverse or kneading rolls or I may provide bearings at theends of all rolls. A rolling mill of the latter type will now bedescribed,

the Mannesmann-type may be subdivided it being however understood that Ido not into two distinct stages, to wit the stage in which the blank isprincipally punched, and the stage in which the blank after having beenpunched, is kneaded internally, or welded, extended and reduced as toits wall thickness by transverse action.

These two stages of the process require sectioning of the rolls ondistinct principles and such principles are not readily realized in asingle pair of rolls, so that it has been 60 suggested to provide twopairs of rolls, one pair principally performing the punching, the otherthe kneading. However the problem of reliably supporting the rolls inmills of this type involves certain difliculties which are overcome,according to this invention, by arranging the axes of the rolls in eachpair at an angle to each other, so that the bearings at the ends of theseveral pairs of rolls will not interfere with each other. I am atliberty to choose whether to provide bearings at both ends of all therolls or of the rolls in one of the pairs only, for instance thepunching rolls.

Apart from the possibility of providing bearings at either end of therolls the novel arrangement of the rolls also renders possible a gradualoverlapping of the two stages of the process with respect to the twopairs of rolls and a suitable guiding of the blank throughout therolling process.

In the drawings aflixed to this specification and forming part thereof arolling mill embodying my invention is illustrated diagrammatically byway of example.

In the drawings Figs. 1 and 2 are end elevations of the mill viewed fromthe entry and from the exit side, respectively,

Fig. 3 is a plan view of the mill,

Fig. 4.- is a vertical section of the mill on the line IV-IV in Fig. 1,

Figs. 5, 6 and 7 are sections on the lines V-V, VI-VI and VII-VII,respectively, in Fig. 3. p v 95 Referring first to Figs. 1 to 4, a and bare the housings of the pairs of rolls, a and d being the punching rollsand e and f the transverse kneading rolls. The rolls in the two pairsare supported in bearings in vertical and horizontal slots of thehousings a and b, g and 7:. being the chocks for the punching rolls 0, dat the entry, and i and is being their chocks at the exit side, while Z,m and n, 0 are the chocks of the kneading rolls e, f at the entrance andexit sides, respectively. The usual adjusting screws q are provided forthe several chocks.

Rotation is imparted to the rolls by means of shafts a" and s for thepunchin rolls, and t and u for the kneading rolls, 'v laeing suitableclutches connecting the journals of the several rolls with theirrespective shafts. w is the blank and m the mandrel.

As appears from Fig. 1, the axes of the punching rolls 9 and h arestaggered horizontally a distance y. The axes of the kneading rolls 6, fare staggered vertically a distance a. The axes of the punching rolls a,d which extend in parallel planes with respect to each other and withthe axes of the blank and the mandrel, are arranged in intersectingvertical planes, and so are the axes of the kneading rolls 6, f whichalso extend in planes parallel to each other and to the axes of theblank and the mandrel.

The operation of this rolling mill is as follows:

As mentioned above, the first pair of rolls 0, 03 substantially orexclusively performs the operation of punching while the second pair ofrolls 6, f substantially or exclusively per forms the operation ofkneading, which means welding, extending and reducing the wallthickness. By arranging the axes of the rolls as above described, it isnot only possible to provide bearings at all the ends of all the rolls,but the two stages of the proc ess now overlap in this sense that thekneading rolls e, 7 will start acting on the blank before the punchingrolls 0, d have completed their work on the blank. As will appear fromFig. 5, the gap A between the rolls a, d is equal to the gap B betweenthe rolls 7, 6. This gradual overlapping is of great advantage withrespect to the stress acting on the blank and also with respect to thefinish of the tube. Another advantage is that while the rolls 0, dperform the punching operation, as illustrated in Fig. 6, the kneadingsections of the rollse, 7 act as guides for the blank, the gap Cbetweenthese rolls being wider than the gap D between the rolls 0. d.Conversely, as shown in Fig. 7 the punching rolls 0, d may act as.guides for the blank during the kneading operation performed by therolls 6, f, the gap E of the punching rolls being wider than the gap Fbetween the kneading rolls.

I wish it to be understood that I do not viesirc to be limited to theexact details of construction shown and described for obviousmodifications will occur to a person skilled in the art.

, In the claims afi'ixed to this specification no selection of anyparticular modification of the invention is intended to the exclusion ofother modifications thereof and the right to subsequently make claim toany modification not covered by these claims is expressly reserved.

I claim 1. Tube-rolling mill comprising a pair of punching and a air oftransverse kneading rolls, the axes of one pair of rolls being arrangedin a plane intersecting the plane in which the axes of the other pairare arranged, and bearings at either end of a roll in one of said pairs.

2. Tube-rolling mill comprising a pair of punching and a pair oftransverse kneading rolls, the axes of one pair of rolls being arrangedin a plane intersecting the plane in which the axes of the other pairare arranged, anfil bearings at either end of said punching r0 s.

3. Tube-rolling mill comprising a pair of punching and a pair oftransverse kneading rolls, the axes of one pair of rolls being arrangedin a plane intersecting the plane in which the axes of the other pairare arranged, anld bearings at either end of said kneading ro s.

4. Tube-rolling mill comprising a pair of punching and a air oftransverse'kneading rolls, the axes of one pair of rolls being arrangedin a plane intersecting the plane in which the axes of the other pairare arranged, and bearings at either end of each roll.

5. Tube-rolling mill comprising a pair of punching and a pair oftransverse kneading rolls, the axes of one pair of rolls being arrangedin a plane intersecting the plane in which the axes of the other pairare arranged, and bearings at either end of a roll in one of said pairs,the rolls in each pair being sectioned so as to enable said kneadingrolls to start operating on the blank before said punching rolls havecompleted their operation thereon.

6. Tube-rolling mill comprising a pair of punching and a pair oftransverse kneading rolls, the axes of one pair of rolls being arrangedin a plane intersecting the plane in which the axes of the other pairare arranged, and bearings at either end of a roll in one of said pairs,said kneading rolls being sectioned so that their kneading sectionsserve for guiding the blank with respect to said punching rolls.

7. Tube-rolling mill comprising a pair of punching and a pair oftransverse kneading rolls, the axes of one pair of rolls being arrangedin a plane intersecting the plane in which the axes of the other pairare arranged, and bearings at either end of a roll in one of said pairs,said punching rolls being sectioned so that their trailing sectionsserve for guiding the blank with respect to said kneading rolls.

8. Tube-rolling mill comprising a pair of punching and a air oftransverse kneading rolls, the axes 0 one pair of rolls being arrangedin parallel to a pair of intersectin planes and alternately on oppositesides 0 5 said planes, a mandrel arranged intermediate said pairs ofrolls and bearings at either end of a roll in one of said pairs.

9. A tube rolling mill comprising a pair of punching rolls and a pair oftransverse n kneading rolls forming together the rolling system, theaxes of both pairs of rolls being arranged symmetrically with respect totwo planes intersecting in the axis of said system. 10. A tube rollingmill comprising a pair 115 of punching rolls and a pair of transversekneading rolls formin together the rolling system, the axes of bot pairsoi rolls being arranged symmetrically with respect to two planesintersecting at right angles in the axis 20 of said system.

In testimony whereof I aflix my signature.

FRITZ KOGKS.

